package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomerException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;


import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {


    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐，同时需要保存套餐和菜品关联关系
     *
     * @param setmealDto
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
        //保存套餐和菜品关联关系，操作setmeal_dish，执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 删除
     *
     * @param ids
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void removeWithDish(List<Long> ids) {
        //满足条件说明是在售状态
        //select count(*) from setmeal where id in(1,2,3) and status = 1
        //查询套餐状态，确定是否可用删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId, ids);
        queryWrapper.eq(Setmeal::getStatus, 1);

        int count = this.count(queryWrapper);
        if (count > 0) {
            //如果不能删除，抛出一个业务异常
            throw new CustomerException("套餐正在售卖中，不能删除");
        }

        //如果可以删除，先删除套餐表中的数据setmeal
        this.removeByIds(ids);
        //删除关系表中的数据 --setmeal_dish
        //delete from setmeal_dish where setmeal_id in(1,2,3)
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId, ids);
        setmealDishService.remove(lambdaQueryWrapper);
    }


    /**
     * 根据id查询套餐以及套餐关联的菜品
     *
     * @param id
     * @return 修改页面上是一个聚合的类
     */
    @Override
    public SetmealDto getByIdWithDish(Long id) {
        Setmeal setmeal = this.getById(id);
        SetmealDto setmealDto = new SetmealDto();
        //拷贝
        BeanUtils.copyProperties(setmeal, setmealDto);

        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId, setmeal.getId());
        List<SetmealDish> setmealDishList = setmealDishService.list(queryWrapper);

        setmealDto.setSetmealDishes(setmealDishList);
        return setmealDto;
    }

    /**
     * 修改套餐以及套餐关联的菜品表
     * @param setmealDto
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateWithDish(SetmealDto setmealDto) {
        //修改套餐信息
        this.updateById(setmealDto);
        //先删除套餐关联的菜品表信息，再进行插入
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId, setmealDto.getId());
        setmealDishService.remove(queryWrapper);

        //设置关联菜品的套餐id
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().map((item) -> {
            //设置菜品对应的套餐id
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
        //批量插入套餐对应菜品的信息
        setmealDishService.saveBatch(setmealDishes);
    }


}
